[Spark][TEST-ONLY] Test identity high water mark inserts when target table has no high water mark #4049
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Which Delta project/connector is this regarding?
Description
Test only PR. Adds some basic additional tests for inserting data into tables when the Identity Column high water mark isn't already defined. Split from the PR making identity column high water mark updates more consistent: #3989
How was this patch tested?
New tests pass.
Does this PR introduce any user-facing changes?
No.